Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska.
Steller sea lions (Eumetopias jubatus) increased in the eastern portion of their range while declining in the Gulf of Alaska and Aleutian Islands from the late 1970s to late 1990s. We constructed ecosystem models of the central and western Aleutians and of southeast Alaska to simultaneously evaluate...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2006
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Online Access: | https://pure.uhi.ac.uk/en/publications/31fb37a4-cb14-49d8-b20c-68e307a368d1 https://doi.org/10.1139/F06-136 |
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ftuhipublicatio:oai:pure.atira.dk:publications/31fb37a4-cb14-49d8-b20c-68e307a368d1 2024-02-04T09:59:17+01:00 Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. Guénette, Sylvie Heymans, Sheila Christensen, Villy Trites, Andrew 2006 https://pure.uhi.ac.uk/en/publications/31fb37a4-cb14-49d8-b20c-68e307a368d1 https://doi.org/10.1139/F06-136 eng eng info:eu-repo/semantics/restrictedAccess Guénette , S , Heymans , S , Christensen , V & Trites , A 2006 , ' Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. ' , CAN J FISH AQUAT SCI , no. 3 , pp. 2495-2517 . https://doi.org/10.1139/F06-136 COMMUNITIES HYPOTHESIS ABUNDANCE SOUTHEASTERN BERING SEA Marine & Freshwater Biology Fisheries STABILITY KILLER WHALE PREDATION SEQUENTIAL MEGAFAUNAL COLLAPSE ORCINUS-ORCA DECLINE POPULATION article 2006 ftuhipublicatio https://doi.org/10.1139/F06-136 2024-01-11T23:20:53Z Steller sea lions (Eumetopias jubatus) increased in the eastern portion of their range while declining in the Gulf of Alaska and Aleutian Islands from the late 1970s to late 1990s. We constructed ecosystem models of the central and western Aleutians and of southeast Alaska to simultaneously evaluate four hypotheses explaining sea lion dynamics: killer whale (Orcinus orca) predation, ocean productivity, fisheries, and competition with other species. Comparisons of model predictions with historical time series data indicate that all four factors likely contributed to the trends observed in sea lion numbers in both ecosystems. Changes in ocean productivity conveyed by the Pacific Decadal Oscillation influenced the abundance trajectory of several species. Fishing could have affected the ecosystem structure by influencing the abundance of Atka mackerel (Pleurogrammus monopterygius) in the Aleutians and Pacific herring (Clupea pallasii) in southeast Alaska. Pacific halibut (Hippoglossus stenolepis) in the Aleutians and arrowtooth flounder (Atheresthes stomias) in southeast Alaska appear to impede sea lion population growth through competitive interactions. Predation by killer whales was important when sea lions were less abundant in the 1990s in the Aleutians and in the 1960s in Southeast Alaska, but appear to have little effect when sea lion numbers were high. Article in Journal/Newspaper Bering Sea Killer Whale Orca Orcinus orca Alaska Aleutian Islands Killer whale University of the Highlands and Islands: Research Database of UHI Atka ENVELOPE(151.789,151.789,60.835,60.835) Bering Sea Gulf of Alaska Pacific Canadian Journal of Fisheries and Aquatic Sciences 63 11 2495 2517 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
COMMUNITIES HYPOTHESIS ABUNDANCE SOUTHEASTERN BERING SEA Marine & Freshwater Biology Fisheries STABILITY KILLER WHALE PREDATION SEQUENTIAL MEGAFAUNAL COLLAPSE ORCINUS-ORCA DECLINE POPULATION |
spellingShingle |
COMMUNITIES HYPOTHESIS ABUNDANCE SOUTHEASTERN BERING SEA Marine & Freshwater Biology Fisheries STABILITY KILLER WHALE PREDATION SEQUENTIAL MEGAFAUNAL COLLAPSE ORCINUS-ORCA DECLINE POPULATION Guénette, Sylvie Heymans, Sheila Christensen, Villy Trites, Andrew Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. |
topic_facet |
COMMUNITIES HYPOTHESIS ABUNDANCE SOUTHEASTERN BERING SEA Marine & Freshwater Biology Fisheries STABILITY KILLER WHALE PREDATION SEQUENTIAL MEGAFAUNAL COLLAPSE ORCINUS-ORCA DECLINE POPULATION |
description |
Steller sea lions (Eumetopias jubatus) increased in the eastern portion of their range while declining in the Gulf of Alaska and Aleutian Islands from the late 1970s to late 1990s. We constructed ecosystem models of the central and western Aleutians and of southeast Alaska to simultaneously evaluate four hypotheses explaining sea lion dynamics: killer whale (Orcinus orca) predation, ocean productivity, fisheries, and competition with other species. Comparisons of model predictions with historical time series data indicate that all four factors likely contributed to the trends observed in sea lion numbers in both ecosystems. Changes in ocean productivity conveyed by the Pacific Decadal Oscillation influenced the abundance trajectory of several species. Fishing could have affected the ecosystem structure by influencing the abundance of Atka mackerel (Pleurogrammus monopterygius) in the Aleutians and Pacific herring (Clupea pallasii) in southeast Alaska. Pacific halibut (Hippoglossus stenolepis) in the Aleutians and arrowtooth flounder (Atheresthes stomias) in southeast Alaska appear to impede sea lion population growth through competitive interactions. Predation by killer whales was important when sea lions were less abundant in the 1990s in the Aleutians and in the 1960s in Southeast Alaska, but appear to have little effect when sea lion numbers were high. |
format |
Article in Journal/Newspaper |
author |
Guénette, Sylvie Heymans, Sheila Christensen, Villy Trites, Andrew |
author_facet |
Guénette, Sylvie Heymans, Sheila Christensen, Villy Trites, Andrew |
author_sort |
Guénette, Sylvie |
title |
Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. |
title_short |
Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. |
title_full |
Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. |
title_fullStr |
Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. |
title_full_unstemmed |
Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. |
title_sort |
ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on steller sea lions (eumetopias jubatus) in alaska. |
publishDate |
2006 |
url |
https://pure.uhi.ac.uk/en/publications/31fb37a4-cb14-49d8-b20c-68e307a368d1 https://doi.org/10.1139/F06-136 |
long_lat |
ENVELOPE(151.789,151.789,60.835,60.835) |
geographic |
Atka Bering Sea Gulf of Alaska Pacific |
geographic_facet |
Atka Bering Sea Gulf of Alaska Pacific |
genre |
Bering Sea Killer Whale Orca Orcinus orca Alaska Aleutian Islands Killer whale |
genre_facet |
Bering Sea Killer Whale Orca Orcinus orca Alaska Aleutian Islands Killer whale |
op_source |
Guénette , S , Heymans , S , Christensen , V & Trites , A 2006 , ' Ecosystem models show combined effects of fishing, predation, competition, and ocean productivity on Steller sea lions (Eumetopias jubatus) in Alaska. ' , CAN J FISH AQUAT SCI , no. 3 , pp. 2495-2517 . https://doi.org/10.1139/F06-136 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1139/F06-136 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
63 |
container_issue |
11 |
container_start_page |
2495 |
op_container_end_page |
2517 |
_version_ |
1789964047411576832 |